冻融循环和干湿循环作用下砂岩断裂韧度及其与强度特征相关性的试验研究
发布时间：2018-07-24 09:39
【摘要】：以三峡库区岸边坡消落带的典型砂岩为研究对象,针对其实际的赋存环境设计了干湿循环和冻融循环2种试验方案,分别研究了2种试验方案过程中砂岩试样的力学特征,分析了浸泡在不同化学溶液中的砂岩试样经历不同循环次数后各力学参数的变化规律.试验结果表明:干湿循环和冻融循环作用下砂岩试样具有明显的"弱化"趋势,其断裂韧度、抗压强度和抗拉强度劣化趋势基本一致,但试样各力学参数的劣化程度却存在差异.其中,断裂韧度KIC的劣化程度最大,抗拉强度次之,抗压强度最小.干湿循环和冻融循环作用过程中砂岩试样各力学参数的劣化程度均非常显著,该现象说明在模拟库岸边坡消落带岩体遭受化学溶液作用时,干湿循环和冻融循环作用均是不可能忽视的影响因素.但比较而言,在冻融循环作用下砂岩试样各力学参数的劣化程度更加显著.不同的化学溶液对砂岩试样力学特征的损伤劣化程度的影响有所不同,酸性化学溶液加剧了砂岩的劣化程度,而SO2-4离子对砂岩劣化的影响大于HCO-3离子的.
[Abstract]:Taking the typical sandstone along the slope of the three Gorges reservoir area as the research object, the dry wet cycle and freeze-thaw cycle test schemes are designed for their actual storage environment, and the mechanical characteristics of the sandstone samples in the process of the two test schemes are studied respectively. The variation of mechanical parameters of sandstone samples immersed in different chemical solutions was analyzed after different cycles. The results show that under the action of dry and wet cycles and freezing and thawing cycles, the sandstone samples have an obvious "weakening" trend, and the deterioration trend of fracture toughness, compressive strength and tensile strength is basically the same. However, the deterioration degree of the mechanical parameters of the specimen is different. The degradation of fracture toughness KIC is the biggest, the tensile strength is the second, and the compressive strength is the least. The deterioration of the mechanical parameters of sandstone samples during dry and wet cycles and freeze-thaw cycles is very significant. This phenomenon shows that when the rock mass of slope collapse zone on the bank of reservoir is subjected to chemical solution action, Both wet and dry cycles and freeze-thaw cycles are the influential factors which can not be ignored. However, the degradation of mechanical parameters of sandstone samples is more significant under the action of freeze-thaw cycle. The effects of different chemical solutions on the damage and deterioration of sandstone samples are different. Acid chemical solution intensifies the degradation of sandstone, while SO2-4 ion has more influence on the degradation of sandstone than HCO-3 ion.
【作者单位】： 西安理工大学岩土工程研究所;西安理工大学土木建筑工程学院;
【分类号】：O346.1
，
本文编号：2140967
[Abstract]:Taking the typical sandstone along the slope of the three Gorges reservoir area as the research object, the dry wet cycle and freeze-thaw cycle test schemes are designed for their actual storage environment, and the mechanical characteristics of the sandstone samples in the process of the two test schemes are studied respectively. The variation of mechanical parameters of sandstone samples immersed in different chemical solutions was analyzed after different cycles. The results show that under the action of dry and wet cycles and freezing and thawing cycles, the sandstone samples have an obvious "weakening" trend, and the deterioration trend of fracture toughness, compressive strength and tensile strength is basically the same. However, the deterioration degree of the mechanical parameters of the specimen is different. The degradation of fracture toughness KIC is the biggest, the tensile strength is the second, and the compressive strength is the least. The deterioration of the mechanical parameters of sandstone samples during dry and wet cycles and freeze-thaw cycles is very significant. This phenomenon shows that when the rock mass of slope collapse zone on the bank of reservoir is subjected to chemical solution action, Both wet and dry cycles and freeze-thaw cycles are the influential factors which can not be ignored. However, the degradation of mechanical parameters of sandstone samples is more significant under the action of freeze-thaw cycle. The effects of different chemical solutions on the damage and deterioration of sandstone samples are different. Acid chemical solution intensifies the degradation of sandstone, while SO2-4 ion has more influence on the degradation of sandstone than HCO-3 ion.
【作者单位】： 西安理工大学岩土工程研究所;西安理工大学土木建筑工程学院;
【分类号】：O346.1
，
本文编号：2140967
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